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III. On a Collection of Fishes from the Bio Paraguay. 

 By G. A. Boulengek, F.B.S. 



Received May 20th, 1895, read June 18th, 1895. 



[Plates III.-VIIL] 



THE Trustees of the British Museum have lately acquired a large collection of 

 Fishes formed by Dr. C. Ternetz at various localities in Matto Grosso and Paraguay. 

 So few fishes have been collected in the Paraguay System since the time of Natterer 

 that it seemed to me desirable to draw up an account of the collection, and to give a 

 full list of all the species represented, several of which are new to science l . 



SCIvENIDtE. 



1. Plagioscion iernetzi. (Plate III.) 

 Plagioscion ternetzi, Boulenger, P. Z. S. 1895, p. 523. 



Outer upper and inner lower teeth considerably enlarged. Depth of body 3 times 

 in total length, length of head 3 to 3£ times ; snout a little longer than diameter of 

 eye, which is 5 to 5^ times in length of head ; interorbital width equal to length of 

 snout, 4 times in length of head ; maxillary extending to below posterior border of 

 eye ; praopercular border rounded, finely denticulated behind, with wide-apart small 

 sense at the angle and below. 15 gill-rakers on lower part of anterior arch, the 

 longest as long as or a little shorter than longest gill-filaments. Lower pharyngeal 

 teeth villiform. Dorsal X, I 33-35 ; third and fourth or fourth and fifth spines 

 longest, | to f length of head. Pectoral nearly f length of head. Anal II 6 ; second 

 spine very strong, §■ length of head. Caudal pointed, densely scaled. The distance 

 between base of anal and base of caudal 2f depth of caudal peduncle. Scales nearly 

 all ctenoid, 95-100 g^; lat. 1. 48-50. Uniform silvery. 



Total length 450 millim. 



Two specimens from Bemanso, Bio Grande, Paraguay. 



This species is allied to Scicena surinamensis, Blkr. 



2. Pachyurus schomburgki, Gthr. 

 Paraguay. 



1 Diagnoses of the new species have appeared in P. Z. S. 1895, p. 523. 



vol, xiv. — part ii. No. 1. — October, 1896. E 



